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Check all the data lines, the test connection near the parking brake (it's a small plastic cover with a metal connector that continues the data circuit), the 7 volt power supply above the gas pedal is a possible culprit, the BCM (body control module) and any part in between that involves the data line with includes the climate control, chime control module etc. The data circuit is a redundant circuit and in general it has to be shorted to ground or both sides open for it to have that type of effect on the cluster. In most cases it's the cluster itself unfortunately. The way it was designed, the parts that are surface soldered just lift off and you have problems from vibration and weather changes that cause this.

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Q: Digital dash will not light up on 86 toronado what to check?
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